I stayed at Yodsakarn's place for 5 days on early April 2018. His father (coolest guy) welcomed us in. He showed us around the place, gave local tips, and generally being very hospitable. He has excellent English too!
The place is very, very good. Much more than I expected. It was a small, cute place, very clean, with lovely bathroom and balcony. The Wi-fi was very fast which is a very plus point for me ;)
The only drawback is the location which was rather far from the main tourist attractions such as Grand Palace, Khao San Road, Chatuchak, and others, and no BTS / MRT station nearby (although there is a bus station just opposite the apartment that could take you to everywhere). But if you like the quiet and the magnificent Chao Phraya River View, definitely stay here.
If I ever go to Bangkok again I'll definitely stay here again. Feels better than home!